Fill blank settings with sensible values, and start your service menu with ready-made items.
Suggested defaults lists every setting that's still blank with a sensible starting value (hours, card hold, labor rate, deposit, service terms, add-ons, Google text). Tick what you want and tap Use the ticked suggestions. Nothing you've set is changed unless you tick it.
The service starter pack (on Service menu) adds common jobs (winterizations, oil changes, lower unit, 100-hour service, impellers, trailer bearings and more) each with a parts kit of shop supplies and materials. Prices are worked out from your labor rate plus parts at retail, rounded to $5. Replace the generic part numbers with the ones you stock and set your supplier on each part.